1) (36-a^2)/(18+3a)=((6-a)(6+a))/3(6+a)=(6-a)/3
2)(9p^2-q^2)/(9p^2+6pq+q^2)=((3p-q)(3p+q))/(3p+q)^2=(3p-q)/(3p+q)
:)
1) (36-a^2)/(18+3a)=((6-a)(6+a))/3(6+a)=(6-a)/3
2)(9p^2-q^2)/(9p^2+6pq+q^2)=((3p-q)(3p+q))/(3p+q)^2=(3p-q)/(3p+q)
:)